Update grid requirement from 0.14.0 to 0.15.0 (#713)

Updates the requirements on [grid](https://github.com/becheran/grid) to permit the latest version.
- [Release notes](https://github.com/becheran/grid/releases)
- [Commits](becheran/grid@v0.14.0...v0.15.0)

---
updated-dependencies:
- dependency-name: grid
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Cargo.toml

@@ -23,7 +23,7 @@ serde = { version = "1.0", default-features = false, optional = true, features =
  "serde_derive",
 ] }
 slotmap = { version = "1.0.6", default-features = false, optional = true }
-grid = { version = "0.14.0", default-features = false, optional = true }
+grid = { version = "0.15.0", default-features = false, optional = true }
 
 [package.metadata.docs.rs]
 # To test all the documentation related features, run: